WHISPER results from a new and original technology, covered by international patents. This technology is incorporated in a new series of low noise gear pumps.
Until now the noise problem was tackled at the design stage by means of paired phased gears or helical gears. However, size and performance (pressure and efficiency) were more or less handicapped. The WHISPER pump solves the noise problem without affecting size and performance.

These unique characteristics are available in four frame sizes. Multiple pumps and motors are also available.
The WHISPER pump incorporates the "zero backlash" principle, i.e. double contact between the meshing teeth. The trapped oil is divided and made smaller, which increases the frequency and intrinsically reduces the amplitude of the flow and pressure ripple. This pressure ripple is the primary source of noise.

In a WHISPER pump, the frequency of the pressure ripple is double that of a standard pump, and equals that of a phased gear pump. WHISPER also produces a smaller amplitude and smoother profile.
The WHISPER pump allows a noise abatement of more than 5 dB(A) over the whole range of speed and pressure, if compared with a standard pump.
The WHISPER pump equals and in some cases surpasses other types of pumps in reducing:

noise emission
overall size
design costs